define "seperation by evaporation"




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Alkyl chlorides and alkyl bromides are typically transformed into alkyl fluorides in the organic reaction known as the Swarts Reaction.

Swarts' reaction is normally used to get alkyl fluorides from alkyl chlorides or alkyl bromides. that is done with the aid of heating of the alkyl chloride/bromide in the presence of the fluoride of some heavy metals.

The partial fluorination of nonpolar natural polyhalides with antimony trifluoride within the presence of antimony pentachloride or chlorine is normally known as the Swarts response and the combination of antimony trifluoride and chlorine (SbF3 + Cl2) is known as the Swarts reagent.

Swarts reaction converts Alkyl chlorides or alkyl bromides Alkyl fluorides. Reacts may be primary halides, secondary halides, alkyl halides and benzyl halides, however does not occur for tertiary reactions, vinyl and aryl halides.

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Answer:

Physical changes are the changes which can be reversed.

Chemical changes are changes which cannot be reversed.

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Explanation:

You see, In a physical change, no new substance is formed. A chemical change is always accompanied by one or more new substance

Answer:

neither

translation

transcription

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Explanation:

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Answer:

Two DNA molecules result from one original molecule:  

✔ neither

Amino acids are linked together at ribosomes:  

✔ translation

RNA base sequences complementary to those in DNA are built:

✔ transcription

Complementary tRNA bases match up to mRNA bases:  

✔ translation

(Photo for proof at the bottom.)

Explanation:

Transcription is where the DNA sequence is replicated onto an RNA strand. The strand of RNA that is replicated has bases that are complementary to the bases on the DNA strand being replicated.

Translation is where the RNA, or mRNA, is transported to the cytoplasm where tRNA bases match with 3 RNA bases, and produces proteins in the process.

Here's a photo of Edge incase you're doubtful.

Explanation:

It should be seen that perhaps the intensity of Ebony timber is greater than the concentration. This can drown if this is heavier than water, but that will floating whether it is not viscous than air. 

Answer:

Plants : Cactus, tumbleweed

Animals : camel, fennec fox

Answer:

Desert plant - Cactus & Tumbleweed

Desert animal - Camel & Scorpion

The weakest base is F-. The series of acids arranged in the decreasing order of their strengths are H1, HBr, HCl, and HF.

Their corresponding conjugate bases arranged in the decreasing order of their strengths are I-, Br-, Cl-, and F-.Thus, F- is the weakest base. It is because the series arranged in the decreasing order of their basic strengths are I-, Br-, Cl-, and F-. The basic strength of the anion decreases from top to bottom of the periodic table due to the decreasing electronegativity of the element to which the anion is attached.

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The total volume of the solution is the 21.25 ml. The diluted Fe³⁺ concentration is 0.0097 M.

The volume of  the water  = 5.50 mL

The molarity of the solution = 0.030 M

The volume = 3 mL

The moles = molarity × volume

The moles = 0.030 × 0.003

The moles = 0.00009

The concentration of solution  = moles / volume

The concentration of solution  = 0.00009 / 0.00550

The concentration of solution  = 0.0163 M

The final volume = 21.25 mL

The diluted Fe³⁺ concentration = ( 0.0163 × 12.75 ) / 21.25

The diluted Fe³⁺ concentration = 0.0097 M

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To calculate the amount of heat required to change 50 g of mercury into vapor at its boiling point, we need to use the following formula:

Q = m * H_vap

where Q is the amount of heat required, m is the mass of the substance, and H_vap is the heat of vaporization.

We are given that the heat of vaporization of mercury is 296 kJ/kg. To use this value, we need to convert the mass of mercury to kilograms:

m = 50 g = 0.05 kg

Now we can use the formula to calculate the amount of heat required:

Q = 0.05 kg * 296 kJ/kg = 14.8 kJ

Therefore, 14.8 kJ of heat needs to be provided to change 50 g of mercury into vapor at its boiling point.

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the Celsius temperature of 1.50 moles of ammonia contained in a 10.0 L vessel under a pressure of 2.0 atm is approximately -56.15 C. The closest answer choice to this value is -50 C.

To determine the Celsius temperature of 1.50 moles of ammonia contained in a 10.0 L vessel under a pressure of 2.0 atm, we can use the Ideal Gas Law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

T = PV/nR

T = (2.0 atm) x (10.0 L) / (1.50 moles x 0.08206 L atm/K mol)

T = 217 K

To convert this temperature to Celsius, we can simply subtract 273.15 K:

T(Celsius) = 217 K - 273.15

T(Celsius) = -56.15 C

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Explanation:

K = °C + 273

1. -234 + 273 = 39K

2. 84 + 273 = 357K

3. 70 + 273 = 343K

4. -24 + 273 = 249K

5. 134 + 273 = 407K

6. 120 + 273 = 393K

-234 °C = 39K

84 °C = 357K

70 °C = 343K

-24 °C = 249K

134 °C = 407K

120 °C = 393K

Answer:

-234°C = 39K

84°C = 357K

70°C = 343K

-24°C = 249K

134°C = 407K

120°C = 393K

Explanation:

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Answer:

Abs : 1.8662 × 10^24

Explanation:

1 mol of CO2 contains 6.02 × 10^24 molecules

So, 3.1 mol of CO2 contains 6.02 × 10^24 × 3.1 mol = 1.8662 × 10^24

Answer:

67.6 years is the time the isotope take to decay from 0.900g to 0.170g

Explanation:

The radioactive decay follows first order law:

Ln [A] = -kt + ln[A]₀

Where [A] is concentration after time t,

k is decay constant:

k = ln 2 / t(1/2)

k = ln2 / 28.1 years

k = 0.02467 years⁻¹

[A]₀ = Initial concentration.

We can replace concentration and use the mass of the isotope:

Ln [A] = -kt + ln[A]₀

Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]

-1.667 = -0.02467 years⁻¹t

t =

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

Half-life can be defined as the times required by the substance to reduce to half of its initial concentration.

The half-life can be expressed as:

Amount left = Initial amount \(\times\) \(\rm \dfrac{1}{2}^\dfrac{time}{Half-life}\)

From the given:

0.17 g = 0.9 \(\rm \times\;\dfrac{1}{2}^\dfrac{t}{28.1}\)

\(\rm \dfrac{0.17}{0.9}\) = \(\rm \dfrac{1}{2}^\dfrac{t}{28.1}\)

0.188 = \(\rm (0.5)^\dfrac{t}{28.1}\)

Taking log on both the sides,

log 0.188 = \(\rm \dfrac{t}{28.1}\;\times\) log 0.5

2.411 = \(\rm\dfrac{t}{28.1}\)

t = 2.411 \(\times\) 28.1 years

Time = 67.75 years.

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

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The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.

Given:

Mass of H2O2 solution = 1.0 g

Concentration of H2O2 solution = 30 wt% (weight percent)

Volume of KMnO4 solution used = 22.143 mL

Molar mass of H2O2 = 34.01 g/mol

Step 1: Calculate the moles of H2O2 in the solution.

Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)

= 1.0 g / 34.01 g/mol

= 0.0294 mol

Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.

According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.

Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)

= 0.0294 mol * (2/5)

= 0.01176 mol

Step 3: Calculate the molarity of the KMnO4 solution.

Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)

= 0.01176 mol / 0.022143 L

= 0.5316 M

Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

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Answer:To calculate the molar mass, first calculate the number of moles of gas using the ideal gas equation. 1 atm. 750 mmHg. (1.00 L). 760 mmHg. 0.0306 mol. L atm.

Explanation:

200ml of NaOH is required to reach the equivalence point.

Titration is a standard quantitative chemical analysis laboratory method for determining the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution of known concentration and volume. Titration is an essential technique in analytical chemistry, and it is also known as volumetric analysis.

A chemical reaction's equivalence point, also known as the stoichiometric point, is the point at which chemically equivalent quantities of reactants have been combined. The equivalence point for an acid-base reaction is the point at which the moles of acid and base would neutralise each other according to the chemical reaction.

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Among the given options, the element that represents X in the transmutation is 49Be (option a).

In the given transmutation, X represents the element that undergoes the nuclear reaction.

Looking at the reaction:

\($X + 2^4He \rightarrow 6^{12}C + 0^1n$\)

We can identify the elements involved in the reaction:

From the given options, the element X can be determined by balancing the atomic and mass numbers on both sides of the reaction.

Comparing the atomic numbers, we have:

X: Z

2⁴ He: 2 (helium)

6¹²C: 6 (carbon)

0¹n: 0 (neutron)

To balance the atomic number on the left side (X + 2^4He), it should equal the atomic number on the right side (6^12C):

Z + 2 = 6

Z = 4

Therefore, the element X has an atomic number of 4, which corresponds to the element beryllium (Be).

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Answer:

2nd law

Explanation:

newtons second law states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its center of mass.

Answer: Amino Acids.

correct me if i'm wrong, i'm not sure.

The equilibrium composition of CO₂ is determined to be 0.59 kmol.

To solve this problem, we can use the ideal gas law and the equilibrium constant expression for the reaction:

CO + 1/2O₂ ⇌ CO₂

Given the initial number of moles of CO and O₂, we can set up an ICE (Initial, Change, Equilibrium) table. Let's assume that x kmol of CO is consumed and converted to CO₂. Then, the change in the number of moles for each species is:

CO: -x kmol

O₂: -0.5x kmol

CO₂: +x kmol

At equilibrium, the number of moles of CO is (2 - x) kmol, O₂ is (3 - 0.5x) kmol, and CO₂ is x kmol. The equilibrium constant expression can be written as:

Kp = (P_CO₂) / (P_CO * P_O₂(1/2))

Given Kp = 16.461 and the pressure conditions, we can substitute the equilibrium partial pressures into the expression:

16.461 = x / ((2 - x) * (3 - 0.5x)(1/2))

Solving this equation yields x ≈ 0.59 kmol.

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Answer:Rocky Mountains

Explanation: 3,000 km (1,900 mi)(straight-line distance)

To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Answer:

B- why or how because any scientist deals with matter it's relationships ,properties and its composition which can be inferred from the questions why and how

Answer: I think this one is the boiling water

sorry if wrong

Explanation:

Answer:

if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m

Explanation:

we know,

1m= 1000mm

as given 5X 10^3 mm we have to convert to meter

now  5X 10^3 mm= 5X 10^3/1000=5m

but if its  5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m

thank u,

In a chemical reaction known as precipitation, two aqueous solutions combine to form an insoluble salt.

Precipitation reactions are typically double displacement reactions that result in the formation of the precipitate, a solid form of residue. The formation of insoluble salts that precipitate out of the solution results from these reactions when two or more solutions with various salt concentrations are combined.

The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the greatest examples of precipitation reactions. This is the precipitation reaction's byproduct, an insoluble salt.

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0.5 moles of KOH contained in 250 mL of a 2.0 M solution of KOH.

Molarity is a measure of the concentration of a solution, defined as the number of moles of solute per liter of solution.

It is commonly denoted as "M" and has units of moles per liter (mol/L). The molarity of a solution can be calculated by dividing the number of moles of solute by the volume of the solution in liters.

Given:

Volume = 250 ml

250 mL = 0.25 L

Molarity = 2.0 m

To calculate the number of moles of KOH in a solution, the formula is:

Moles of solute = Molarity x volume of solution (in liters)

Use the formula:

Moles of KOH = 2.0 M x 0.25 L

Moles of KOH = 0.5 moles

Thus, there are 0.5 moles of KOH in 250 mL of a 2.0 M solution of KOH.

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Answer:

6 pH is a weak acid

Explanation:

Generally, a strong acid has a pH of about zero to 3.

The pH scale typically ranges from 1 to 14, with lower numbers representing acids, higher numbers, bases. Neutral liquids like water have a pH of 7.

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2.5 moles of oxygen are required

Answer:

solution given:

the reaction is:

\(4Na +O_2\rightarrow2 Na_2O\)

it shows that

4 moles of sodium reacts with 1 mole of oxygen to produce 2 mole of sodium oxide.

so

10 moles of sodium reacts with \(\frac{1}{4}*10=\frac{5}{2}=2.5\) moles oxygen to produce \(\frac{2}{4}*10=5\) mole of sodium oxide.